| feral | (adjective) wild and menacing | Synonyms: ferine, savage |
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| fergusonite | (noun) a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals | - |
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| feria | (noun) (in Spanish speaking regions) a local festival or fair, usually in honor of some patron saint | - |
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| (noun) a weekday on which no festival or holiday is celebrated | - |
| ferial | (adjective) of or relating to or being a feria | - |
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| ferine | (adjective) wild and menacing | Synonyms: feral, savage |
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| fermata | (noun) (music) a prolongation of unspecified length on a note or chord or rest | - |
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| (noun) a musical notation (over a note or chord or rest) that indicates it is to be prolonged by an unspecified amount | - |
| ferment | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: fermentation, fermenting, zymolysis, zymosis |
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| (noun) a state of agitation or turbulent change or development | Synonyms: agitation, fermentation, tempestuousness, unrest |
| (noun) a substance capable of bringing about fermentation | - |
| (verb) go sour or spoil | Synonyms: sour, turn, work |
| (verb) cause to undergo fermentation | Synonyms: work |
| (verb) work up into agitation or excitement | - |
| (verb) be in an agitated or excited state | - |
| fermentable | (adjective) capable of being fermented | - |
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| fermentation | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermenting, zymolysis, zymosis |
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| (noun) a state of agitation or turbulent change or development | Synonyms: agitation, ferment, tempestuousness, unrest |
| fermenting | (noun) a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol | Synonyms: ferment, fermentation, zymolysis, zymosis |
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| fermentologist | (noun) a specialist in wine making | Synonyms: enologist, oenologist |
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| fermi | (noun) a metric unit of length equal to one quadrillionth of a meter | Synonyms: femtometer, femtometre |
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| fermion | (noun) any particle that obeys Fermi-Dirac statistics and is subject to the Pauli exclusion principle | - |
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| fermium | (noun) a radioactive transuranic metallic element produced by bombarding plutonium with neutrons | Synonyms: atomic number 100, Fm |
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| fern | (noun) any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores | - |
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| ferned | (adjective) abounding in or covered with ferns | Synonyms: ferny |
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| fernless | (adjective) devoid of ferns | - |
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| fernlike | (adjective) resembling ferns especially in leaf shape | Synonyms: ferny |
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| ferny | (adjective) abounding in or covered with ferns | Synonyms: ferned |
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| (adjective) resembling ferns especially in leaf shape | Synonyms: fernlike |
| ferocious | (adjective) marked by extreme and violent energy | Synonyms: fierce, furious, savage |
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| ferociously | (adverb) in a physically fierce manner | Synonyms: fiercely |
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| ferociousness | (noun) the trait of extreme cruelty | Synonyms: brutality, savagery, viciousness |
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| ferocity | (noun) the property of being wild or turbulent | Synonyms: fierceness, furiousness, fury, vehemence, violence, wildness |
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| ferret | (noun) domesticated albino variety of the European polecat bred for hunting rats and rabbits | - |
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| (noun) musteline mammal of prairie regions of United States; nearly extinct | Synonyms: black-footed ferret, Mustela nigripes |
| (verb) search and discover through persistent investigation | Synonyms: ferret out |
| (verb) hunt with ferrets | - |
| (verb) hound or harry relentlessly | - |
| ferric | (adjective) of or relating to or containing iron | Synonyms: ferrous |
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| ferricyanide | (noun) salt of ferricyanic acid obtained by oxidation of a ferrocyanide | - |
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| ferrimagnetism | (noun) a phenomenon in ferrites where there can be incomplete cancellation of antiferromagnetic arranged spins giving a net magnetic moment | - |
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| ferrite | (noun) a solid solution in which alpha iron is the solvent | - |
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| (noun) a magnetic allotrope of iron; stable below 906 degrees centigrade | Synonyms: alpha-Fe, alpha-ferrite |
| ferritin | (noun) a protein containing 20% iron that is found in the intestines and liver and spleen; it is one of the chief forms in which iron is stored in the body | - |
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| ferrocerium | (noun) a pyrophoric alloy of iron with cerium; used for lighter flints | - |
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| ferroconcrete | (noun) concrete with metal and/or mesh added to provide extra support against stresses | Synonyms: reinforced concrete |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| ferromagnet | (noun) any material that has ferromagnetic properties. | - |
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| ferromagnetic | (adjective) relating to or demonstrating ferromagnetism | - |
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| ferromagnetism | (noun) phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed | - |
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| ferrous | (adjective) of or relating to or containing iron | Synonyms: ferric |
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| ferrule | (noun) a metal cap or band placed on a wooden pole to prevent splitting | Synonyms: collet |
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| ferry | (noun) transport by boat or aircraft | Synonyms: ferrying |
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| (noun) a boat that transports people or vehicles across a body of water and operates on a regular schedule | Synonyms: ferryboat |
| (verb) travel by ferry | - |
| (verb) transport by ferry | - |
| (verb) transport from one place to another | - |
| ferryboat | (noun) a boat that transports people or vehicles across a body of water and operates on a regular schedule | Synonyms: ferry |
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| ferrying | (noun) transport by boat or aircraft | Synonyms: ferry |
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| ferryman | (noun) a man who operates a ferry | - |
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| fertile | (adjective) capable of reproducing | - |
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| (adjective) marked by great fruitfulness | Synonyms: fat, productive, rich |
| (adjective) bearing in abundance especially offspring | Synonyms: prolific |
| (adjective) intellectually productive | Synonyms: fecund, prolific |
| fertilisation | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilization, impregnation |
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| (noun) making fertile as by applying fertilizer or manure | Synonyms: dressing, fecundation, fertilization |
| fertilise | (verb) introduce semen into (a female) | Synonyms: fecundate, fertilize, inseminate |
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| (verb) provide with fertilizers or add nutrients to | Synonyms: feed, fertilize |
| (verb) make fertile or productive | Synonyms: fecundate, fertilize |
| fertiliser | (noun) any substance such as manure or a mixture of nitrates used to make soil more fertile | Synonyms: fertilizer, plant food |
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| fertility | (noun) the property of producing abundantly and sustaining vigorous and luxuriant growth | Synonyms: prolificacy, rankness, richness |
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| (noun) the state of being fertile; capable of producing offspring | Synonyms: fecundity |
| (noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year | Synonyms: birth rate, birthrate, fertility rate, natality |
| fertilizable | (adjective) capable of being fertilized | - |
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| fertilization | (noun) creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant | Synonyms: fecundation, fertilisation, impregnation |
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| (noun) making fertile as by applying fertilizer or manure | Synonyms: dressing, fecundation, fertilisation |
| fertilize | (verb) introduce semen into (a female) | Synonyms: fecundate, fertilise, inseminate |
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| (verb) provide with fertilizers or add nutrients to | Synonyms: feed, fertilise |
| (verb) make fertile or productive | Synonyms: fecundate, fertilise |
| fertilizer | (noun) any substance such as manure or a mixture of nitrates used to make soil more fertile | Synonyms: fertiliser, plant food |
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| ferule | (noun) a switch (a stick or cane or flat paddle) used to punish children | - |
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| fervency | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervidness, fervor, fervour, fire |
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| fervent | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervid |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervid, fiery, impassioned, perfervid, torrid |
| fervently | (adverb) with passionate fervor | Synonyms: fervidly, fierily |
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| fervid | (adjective) (archaic) extremely hot, burning, or glowing | Synonyms: fervent |
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| (adjective) characterized by intense emotion | Synonyms: ardent, fervent, fiery, impassioned, perfervid, torrid |
| fervidly | (adverb) with passionate fervor | Synonyms: fervently, fierily |
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| fervidness | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervor, fervour, fire |
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| fervor | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervidness, fervour, fire |
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| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervour, inflammation |
| fervour | (noun) feelings of great warmth and intensity | Synonyms: ardor, ardour, fervency, fervidness, fervor, fire |
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| (noun) the state of being emotionally aroused and worked up | Synonyms: excitation, excitement, fervor, inflammation |
| feryaz | (noun) a broad kaftan with long sleeves, worn by the nobility in Russia in the 16th and 17th centuries. | - |
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